Fibers from a paint roller are caused by either rolling on too dry, trying to spread the paint too far or a poor quality roller cover. It's very important to apply enough paint to keep your finish smooth and your equipment working properly and good equipment is always a good place to start a project.
120 grit sandpaper on a drywall sanding block or a pole sander with 100-120 grit screens will get your walls back to smooth.
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